Latch operated clutch



Dec. 21, 1948. F. E. CURTIS 2,456,928

- LATCH OPERATED CLUTCH Filed Dec. 4, 1944 r 5 Sheets-Sheet l A /NvavroR Y ATTORNEYS Dec. 21, 1948. CURTIS 2,456,928

LATCH OPERATED CLUTCH Filed Dec. 4, 1944 5 Sheets-Sheet 2 //v van 10/2Hamill 1 Uarzz's 5y oa/mm a ATTORNEY-S Dec. 21, 1948. F, -r 5 2,456,928

LATCH OPERATED CLUTCH Filed Dec. 4, 1944 Y 5 sheets-sheet 3 BY M MwArromvzya Dec. 21, 1948. F. E. CURTIS 2,455,928

' LATCH OPERATED CLUTCH Filed De'c. 4, 19.44 5 Sheets-Sheet 4 Dec. 21,1948. F, E, ums 2,456,928-

LATCH OPERATED cLUTdH File d Dec 4, 1944 5 Sheets-sheaf:

5y 2AM W ATTORNEYS Patented Dec. 21, 1948 LATCH OPERATED CLUTCH FranklinE. Curtis, Euclid, Ohio, assignor to Addressograph-MultigraphCorporation, Cleveland, Ohio, a corporation of Delaware ApplicationDecember 4, 1944, Serial No. 566,487

9 Claims.

This invention'relates to clutches of the positive type and particularlyto such clutches that are adapted for quick-pickup operation.

Quick-pickup clutches as commercially used are in most instances of sucha character as to be adapted for operation as one-revolution clutches,and since clutches of this character are engaged and disengaged quitefrequently, the Wear and strain upon the parts is recognized as beingexceedingly great. It is therefore an important object of this inventionto enable clutches of the quick-pickup type to be constructed in such away as to insure positive pickup action and long life of the parts ofthe clutch. An object related, to the foregoing is to enablequick-pickup clutches of the aforesaid character to be so constructedthat the elements or parts thereof may be produced through the use ofconventional metal Working operations and machines.

A, further object of the present invention is to so relate the elementsof a quick-pickup clutch one to the other that the stresses encounteredduring the engaging movement of the parts are applied to such parts insuch a manner that the stresses are distributed efiiciently in suchparts, thereby to avoid breakage of such parts and insure properoperation and long life of the clutch. Objects related to the foregoingare to so form and relate the parts of a quick-pickup clutch that thewearing parts of the clutch may be made from hardened metal, thereby toinsure long life thereof.

Other and further objects of the present invention will be apparent fromthe following description and claims and are illustrated in theaccompanying drawings which, by way of illustration, show a preferredembodiment and the principle thereof and what I now consider to be thebest mode in which I have contemplated applying that principle. Otherembodiments of the invention embodying the same or equivalent principlemay Fig. 5 is a sectional view taken substantially along the line 55 ofFig.2;

Figs. 6 and 7 are enlarged views showing details of the clutch teeth;

Fig. 3 is a sectional view taken substantially along the line 8-43 ofFig. 1 and illustrating the relationship of the internal parts of theclutch when the clutch is disengaged;

be used and structural changes may be made as Fig. 9 is a view similarto Fig. 8 and illustrating the relationship of the parts of the clutchjust after the. clutch engaging elements have been released and beenmoved into engaging relationships; t

Fig. 10 is a view similar to Fig. 8 and illustrating the relationship ofthe parts of the clutch as it approaches the point in its rotation wherethe disengagement is to take place; and

Fig. 11 is aview similar to Fig. 8 and showing the relationship of theparts after the stop lever of the clutch has been engaged and justbefor'e'the disengaging movement of the parts has started. 1

For purposes of disclosure the invention has been illustrated herein asembodied in a quickpickup clutch it having a mounting bracket l ladapted to be secured by bolts I2 on a suit-able support l3 that mayform a part of the machine in which the clutch I9 is to be used. Thebracket H has an upstanding web l4 having a bearing 15 formed thereon,Fig. 3, and a U-shaped portion 16 extends downwardly from the bracket II and then upwardly at ll to afiord an outboard bearing l8 aligned withthis bearing l5 and in which a clutch shaft 28 is supported so as toextend from the bearing l8 and through the bearing [5. The end of theshaft as that projects beyond the bearing 151s in the present caseutilized for connecting the clutch to the mechanism that is to be driventhereby, and in the present instance this connecting means comprises ahead 2 l secured by a set screw 22 on the end of the shaft 20, and atransmitting link 23 is'connected to the head 2| eccentrically thereofby bearing pin 24. 1

The clutch IE has a driven member 25 and a driving member 26 disposed onthe shaft between the bearings I5 and 18, the driven member beingsecured to the shaft 20 while the driving member 26 is freely rotatableon the shaft 20, and hence the shaft 28 is driven only when the drivingmember 26 is opcratively connected to the driven member 25 through theclutch mechanism of the present invention. The driving member 26 of thepresent invention may be driven by varying or different means, but asherein shown, this member is adapted to be constantly driven through ageared driving connection, and the member 26 is accordingly formed as apart of a gear 26, the teeth of which are illustrated in F gs. 1, 2 and3 as being engaged with a driving pinion 2? that is fixed on the end ofthe shaft 28 sup-v ported in a bearing 29 afforded as a part of thebracket HI. Thus where the pinion 21 i rotated constantly irrta:counter-clookwise direction, the.

disc-like body that has an annular fiange-tli formed thereon near itsouter edge so as ,to pro ject from the body of the gear-26A toward:the.v driven member of the clutch, and it will be observed in Figs. 4and 5 of.the,drawings that the annular flange is spaced' outwardly'in=-aradial direction from the outer surface of--anim tegral hub 3! that isformed on the gear 26A toafford the desired stabilityof mounting of. the

driving member 26'upon-the shaft 20.- InHthe present. instance the.hub13 II. is. mounted upon the shaft 20 through the useof..a-.bearingsleeve 32;, andnitashould be noted-.thatsimilar bearingsleeves fiand 342219 utilizedat the points Where the-=shaftl2fleissupported.inthelbearings l5 and I 35 that. is.- disposed .Within,the-.flange 30. Thus, as willberevidentinFigs. land. 5, theflange 3Binternally shouldered .as .at 36 and the annula r ring 35 is inserted.intol therflange fill-so as to set firmlyagainst the..annular shoulder36, the

ring..35,.beingheld: against rotationwith respect to the flange 39 bysuitable fitting. orshrinking operations. The-ring fifigas shown inFigs. 2 and- 5 to 8,-.is.-.formed -;t0-afiord a series of internalclutch.teethz ilhand'theseteeth are adapted to be F engaged bycomplementalclutch means that are providedon the driven member :25 ofthe clutch,

as will presently be described --indetail. It Will bewobservedcthattheteeth 40 are relatively small The-driven' member 25 -ofthe clutchisin the present instanceinthe'nature ofadisc25A having-an=-integral hubdz securedtuponthe shaft 20 1 bya set screw-43 so that drivingor--rotating movement may be=transmittedfrom-the disc 25A to the shaft'20. When-the clutch member 25 is to be-driven from the *drivingmember26 of the r Theriiange 3E! projectsufrom the-body of. the

gear in...anaxial direction for agreater distance than tthe, hub= 3|,and-.thisadded projection of the-flange SO-isntllized-in lth'espresentinstance to afiord a mounting for a hardened annular ring posedintermediate the ends of such clutch dogs, and insofar as the directionof rotation of the clutch may be concerned, the teeth 46 of the clutchdogs d5 are formed adjacent to what may be termed the trailing ends ofsuch clutch dogs, as will be evident in Figs. 6 to 11 of the drawings.Since the ends of the clutchadogs 45 u'ponwhich the teeth d6. are formedconstitute the trailing ends of such clutch dogs, these trailing endshave been herein designated as GET, While the leading ends ofthe clutchdogs have been designatedas ML. The clutch dogs are of relatively simpleform and are adapted for manufacture by simple clutch, a pair ofclutch'dog-s id-mounted on the disc:-:25A are shifted from thedisengagedpositions'of Figs. 6" and 8 to theengaged positions of Figs. 7and 9, therebyto engage clutchteeth 4S on the .dogs 45 with theclutchteeth 400i the driving member 26 of-the clutch. The clutch dogs 35aredisposedon oppositesides of the axis of the shaft-28, andmare'pivotally-mounted' on.

the disc. 25A by mountingstuds ilp: The studs 47 are securedin place onthedisc 25A by riveted ends d'iB,--and-itwill :be observed inFig. 5 thatthe. studs fill are shouldered at HA so-as to disof the ring =35. Inattaining this action the end i of-,the,hub.,.-3l. .actsv-i'nloppositionto the shoulder pose.theclutchdogs-in the space directly inside 41A.to.' hold .the dogs ,445 in. position, v.on, the studs 7 31111 Thepivotal. mounting r axis that isthus afio'rdedior each of the clutchdogs 45 is disfor engaging andholding thearm 52 'ofthe'con when the stoplever is in the position-shownin" lever-.55 isnormallyiurged.by'gravitytto its lowerand'freadilyperformed machiningoperations.

- Thus each clutch'dog 45 is formed from a rectangular bar of stock andthe clutch teeth 46 are formed at one'corner of bar of stock as shown inFigs. G te ll of the drawings. The mounting opening for the supportingstud 47 is, of course, I formed in the bar of stock, and in the formherein shown, thismounting opening is so disposed that the end dfiTofthe clutch dog. is somewhat longerthanthe end iFsL. In order that theclutch dog 55 maybe made of a relatively great overall I length, the endQBL'of the clutch dog is cut "away at .an ,angle' as indicated at 48inFigs..6,"8 and.9, thus affording relatively greater length'in the end451'; While. avoiding interference of this end with the teeth 590f. the.driving member .26. When the clutclrdo'gs d5'are thus'formedfleach":clutch dog has a fiat side surface 29 that extends" throughoutithelength of the portions oriends'" i'iT'fand 45L; and theforcesrequired'for engage ing and disengaging .the clutchv dogs areapplied .3 to the side" surfaces lil of .the clutchdo'gs. Inv attainingthisresult, a control'memberfifi-"j is utiliz'ed,.this .control member50 beingirectanel gular in form as viewed in Figs.18'and.9and*having acentral opening 5! that. surrounds" the shaft 213 so asto dispose thecontrol member 50 between the .disc 25A or" the driven member ofthe'clutcl rv and .the end of the hub 35 of the driving'member; oftheclutchyas. shown 'in' Figs. 4 and 5. Thus. the'controtmember 553 isdisposed inpart within" the'ring Shof the driving memberyandis dis-'posedinpart inthe space-that is alignediwith'" the'shoulders MA, as willbe evidentimFig; 5 of the-drawings,- and at one' oi' its ends,-the'con=trol member fiil hasan arm 52' that projects out-Q wardly beyond theperipheral edge 25B=fiof the disc- 25A; and by-engagement of" thearmEZQTit' is possible to hold the control member -50' against rotation.

In the present instanceymeans are provided' trol member 5i and-suchmeans comprise a stop-'- lever 55 pivoted at 5% 011a stationary-mountingstud- 5? secured byscrew-58 to an=--upstandi1igwebportionfi of: themounting'bracket HA The stop lever SE eXtends from its pivot 5% to apoint' such that its free end is disposedadjacent to-theupward-edge ofthe disc 25A; and the endof-the stop leverfifi isbent laterally as at55A so -that Figs. lGand 11 it is disposed in the path'of: the armz-Ed,of the .controlemember 5&5; The stop or -'efl?ectiveposition, and inthe present cases:- solenoid .ec :is supported rover. the'lever $5 on-abracket 6i mounted on'aninpstandingrportion MA ofzthe WebiM soth'atthearmature'isZ of-the solenoid 68 may be connected by a link 63 to'theStOPWlGVGIyfiE-p Thus,- whenathe solenoidsMile energized; the stoplever.55;isvraised'fto ;its.;re-: v leased position of Fig. 9, and whenthis takes place, the control member 50 is released for movement in thedirection of rotation of the driving member 26, or in other words in acounter-cloclrwise direction as viewed in Figs. 8 to ll of the drawings.When the driven member of the clutch is in its stopped position of Fig.8, the tooth 55A. of the stop lever 55 is disposed within a notch 65formed in the edge of the disc 25A as will be evident in Figs. 2 and 8to 11 of the drawings, and it will be recalled that the tooth 55A of thestop lever 55 is also engaged with the leading edge of the arm 52 sothat it holds the control member 583 against rotation in a forward orcounter-clockwise direction shown in Fig. 8. When this conditionprevails as shown in Fig. 8 of the drawings, the side edges of thecontrol member 50 are engaged. with the side edges iii of the clutchdogs so that these clutch dogs are disposed in their inefiective ordisengaging positions. The force necessary for moving the clutch dogs 45to such disengaged positions is actually applied by engagement of theside edges of the control member with the edges 29 adjacent to the ends45L of the clutch dogs at substantially the corners lfiLC, indicated inFigs. 6 and 7. When the parts are in this relationship of Fig. 8, thecontrol member 50 is constantly and yieldingly urged in an advancing orcounter-clockwise direction as viewed in Fig. 8, thereby to tend to movein such a direction as to impart engaging movement to the clutch dogs55, and such engaging movement would in such an instance be imparted tothe clutch dogs by engagement by the sides of the control member withthe edges d9 of the clutch dogs adjacent to the ends 455T, atsubstantially the corners 45TC, indicated in Figs. 6 and 7 of thedrawings. Thus upon release of the stop lever a yielding imthe adjacentor left hand face of the disc 25A as viewed in Fig. 4, and the other endof the spring 69 is anchored on a pin Ill secured in the disc 25A. Thusthe spring 69 is effective to con stantly urge the control member 50 inan advancing or counter-clockwise direction from the position shown inFig. 8 to the position shown in Fig. 9, and when the controlmemberisyreleased, so that such advancing movement of the control member maytake place, the movement of the control member serves to impart clutchengaging movement to the clutch dogs 65. As the clutch dogs 45 move fromtheir positions of Fig. 8 toward the positions shown in Fig. 9, theteeth M5 on the trailing ends of the clutch dogs move into the path ofthe teeth 40 of the driving member of the clutch, and upon engagement ofthe teeth 49 of the driving member with the teeth d5 of the clutch dogs,the rotating motion of the driving member 26 transmitted longitudinallyof the clutch dogs to the mounting studs 47, thereby to impart rotativemovement to the driven member 25 of the clutch.

Upon the engagement of the clutch as aforesaid, the rotative movement ofthe driven member 25 of the clutch will continue until such time asthe'stop lever 55 is rendered effective, and this may be done so as tolimit the clutch to a single revolution, or the stop lever 55 may beretained in its ineffective position on Fig. 9 until such time it isdesired to release the clutch. When the clutch is to be thus released,the stop lever 55 is allowed to move toward the outer edge of the disc25A until it rides on this peripheral edge, as shown in Fig. 10, and asthe rotative move ment of the driven member of the clutch pro-- gresses,the arm 52 approaches the tooth 55A or" the stop lever as will beevident in Fig. 10. When the arm 52 of the control member 56 engages thetooth 55A of the stop lever, it will be evident that the rotativemovement of the control member 50 will be stopped in the relationshipshown in Fig. 11. It will be clear however the clutch dogs 45 are stillengaged with the teeth 3!) of the driving member 25 of the clutch, andhence the rotative movement of the driven member 25 of the clutchengagement with the side edges of the control member 5E3 which is nowstationary, and hence, after such engagement has taken place, thecontinued rotative movement of the driven member 25 of the clutch willcause the leading corners l iLC of each clutch dog 35 to ride along theedge surfaces of the control member, thereby to impart clockwiserotation to the clutch dogs .45 about their pivot studs ll. This ofcourse serves to move the ends 451 of the clutch dogs 45 inwardly awayfrom the teeth ill, thereby to disengage the teeth 46 from the teeth 40.In the course of such. further rotative movement of the driven member ofthe clutch from the relation ship shown in Fig. 11 to the relationshipshown in Fig. 8, the spring 69 is again tensioned, and after the clutchdogs A35 have been fully disengaged, the tooth 55A. of the stop leverdrops radially into the notch 65, thereby to stop the driven member in aparticular rotative position and prevent retrograde movement of thedriven member. In this connection, it should be observed that the leadinedge of the notch E5 is cut away as at A, thereby to enable the tooth55A to start its inward radial movement somewhat prior to the time whenthe notch t5 moves into alignment with the tooth 55A. With thisarrangement, the tooth 55A may first be engaged by the trailing edge ofthe notch as to positively stop the forward rotation of the drivenmember 25 of the clutch, and as an incident to such stopping action maycontinue its inward radial movement so as to become fully engaged withthe notch 65 and thereby prevent retrograde movement of the drivenmember.

In attaining the desired quick-pickup action in the clutch of thepresent invention, the teeth 49 on the driving member and the teeth 46on the clutch dogs M are so formed as to facilitate the engaging anddisengaging movement of the clutch dogs and to also insure that suchclutchthey are formed, and these surfaces are so formed that the drivingfaces, or in other words the faces d to :Which the driving: f ones areapplied, areeach: arranged substantially;-perpendicular to a radialplane extended from the axis 471: of thei-clutch dogto each such face.Such'drivin'g faces of the clutch teeth 45 have been indicated by thereference character 45D in Fig. 6' ottne drawings," and the opposedfaces of the teeth 4i) have been indicated'by-the reference'character5WD; With? this arrangement of the driving faces 40D and dicular to, thedirection which'forceis being i transmitted from the faces dill) to thefaces 46D. Similarly, in an engaging movement of the clutch dogs le;therequired-movements of the clutch dogs are relatively small, and suchmovements may be accomplished with such speed as to attain substantiallyfull engagement of the teeth prior to the time when the surfaces @813strike the sur faces WD. When such striking engagement of the'surfaceslfiD with the surfaces 4813 takes place, it will be observed that theaction against; each-suriace ifiD is directed toward the axis of theclutch dog through the main body of3the clutch dog so that the forcesare'distributed as compression i'orces rather'than as shearingor tensionforces and any tendency to break off the tooth M5 is thereby inimized.Similarly, the application of forces Vv 11in the ring 35 .is such thatthe reaction through the surface MD of;

each tooth is into the main bodyof the ring andrather than transverselyof the tooth. l Hence any tendency to break on the tooth-Allis minimized with the construction of the'present clutch;

In view of the foregoing description it will beapparent that the presentinvention 'providesfa quicl-z-pickup clutch that is simple inconstruction and positive in operation, and this clutch as constructedunder the present invention is madefrom parts or elements that areadapted formanufacture through the use of" conventionalmachine tools andconventional machining operations. Thus the clutch of the presentinvention possesses quick-pickup characteristics and thesecharacteristics are attained in such a Way that a long useful life ofthe clutch isassured.

Hence, while I h to illustrated and described the preferred embodimentof my invention; it is to bexunderstood that this is capable ofvariation and-modification and I thereforedo not'wishto be limited tothe precise details set forth, butdesire to avail myself of such changesandalterations as fall within the purview of the following claims.

I claim:

1. Ina quick-pickup clutch, a constantly rotat' ing driving member, anannular element on said driving member having an annular'series of in rternal clutch teeth formed thereon concentric said-driven membe13 saidclutch dogs having teeth formed thereon adjacent to correspondingendsethereof forengagement With the teeth on:

' driving-member having an annular series of insaidannular-1element-ofwsaid drivingv member, a

- for imipartingclutch engaging anddisengaging movement to: said clutchdogs upon rocking movement of saidcontrol member relative to saiddriven'member, spring means acting-between said control member and saiddriven memberand tending-i110" rock said-'control member in one di--rection with :relationto "said driven member to impart: clutch engagingmovement to said clutch dogs,--and meanson said control memberprojecting ina-generally radial direction beyond said driven member andadaptedfor engagement to impartrocking movement to said control memberin"the=other-direction to thereby disengage said clutch dogs from saiddriving member.

2. 1m a-quick-piclsupclutch, a constantly rotating driving member, anannular element on said.

ternal clutch teeth formed thereon concentric With-the'rotative axis ofsaid driving member, a

driven member supported for rotation on an axisconcentric with therotative axis'of said driving member, a pair of-clutch dogs pivoted'onsaid driven member on axes parallel to and disposed on oppositesides ofthe rotative axis of said driven member, said clutch dogs' havingteethformed thereon adjacent-to corresponding ends thereof for-engagementwith the teeth on said annular element of said driving-member, a controlmember pivoted-on'said' axis of rotation of said drivenmemberanddisposed between said clutch dogs,

. saidcontrolmember havingside edge surfaces disposedadjacent saidclutch dogs, and said clutch dogs each havingsurfaces on opposite sidesof their pivotalaxes for engagement by said control membertoselectively'impart clutch engaging or disengaging movement to saidclutch dogs as incident to rocking movement OfSEtld control memberrelative .to-said driven member, spring means-acting between saidcontrol member and said driven-member and tending to rock said controlmember in onedirection with relation to said drivenmember to impartclutch engaging mcvemerit to said clutch dogs,- and meansonsaidcontrol-member projecting in a generally radial di rection beyondsaid driven-member and'adapted forengagement to cause rocking movementof said control member in the other direction rela tive' to said drivenmember to thereby disengage said clutch dogs from said driving member.

3. Inaclutch of the character described, a constantlyirotatingidrivingmem'ber, an annular ele* ment "on said driving member having anannular series of internal clutch teeth formed thereon concentricvliththe rotative axis of said driving member, a driven member supported forrotation on =an-axis concentric with the rotative axis of saiddrivingmemben; a pair of clutch dogs pivoted on' said driveh member onaxes parallel to and disposed on opposite sides of the rotative axis ofsaiddrivenmember, said'clutch dogs having teeth formed thereon adjacentto corresponding ends thereof forengagement with the'teeth on saidpartclutch engaging movement to said-clutch dogs, and means on saidcontrol member adapted for engagement during rotation of said drivenmember to impart rocking movement to said control member in the otherdirection to thereby disengage said clutch dogs from said drivingmember.

4. In a quick-pickup clutch, a constantly rotating driving member, anannular element on said driving member having an annular series ofinternal clutch teeth formed thereon concentric with the rotative axisof said driving member, a driven member supported for rotation on anaxis concentric with the rotative axis of said driving member, a pair ofclutch dogs pivoted on said driven member intermediate their ends onaxes parallel to and disposed on opposite sides of the rotative axis ofsaid driven member so as to afford ends on each dog extending inopposite directions from its pivotal axis, said clutch dogs having teethformed thereon adjacent to corresponding ends thereof for engagementwith the teeth on said annular element of said driving member, thedriving faces of such teeth of each dog being formed as substantiallyflat surfaces disposed in planes substantially perpendicular to radialplanes extended from the pivotal axis of the dog to each such drivingface, and a control member pivoted on said axis of rotation of saiddriven member between said clutch dogs for rocking movement relative tosaid driven member and operable to engage corresponding opposite ends ofsaid dogs selectively to impart clutch engaging and disengagingmovements selectively to said clutch dogs.

5. In a clutch of the character described, a constantly rotating drivingmember having an integral annular flange spaced substantially from theaXis thereof, a separately formed annular element secured on saiddriving member having an annular series of internal clutch teeth formedthereon concentric with the rotative axis of said driving member, adriven member comprising a disc supported for rotation on an axisconcentric with the rotative axis of said driving member and disposedopposite and in axially spaced relation to the open end of said flange,a pair of clutch dogs pivoted on said disk on axes parallel to anddisposed on opposite sides of the rotative axis of said driven memberand in the space within said flange, said clutch dogs having teeth.formed thereon adjacent to corresponding ends thereof for engagementwith the teeth on said annular element of said driving member, a controlmember pivoted on said axis of rotation of said driven member anddisposed between said clutch dogs, said control member having side edgesurfaces disposed adjacent said clutch dogs, and said clutch dogs eachhaving surfaces on opposite sides of their pivotal axes for engagementby said control member to selectively impart clutch engaging ordisengaging movement to said clutch dogs as an incident to predeterminedrocking movement of said control member in one direction or the otherrelative to said driven member, spring means acting between said controlmember and said driven member and tending to rock said control member insaid one direction with relation to said driven member to impart clutchengaging movement to said clutch dogs, and means on said control memherin said space and projecting between said disc and said flange in agenerally radial direction beyond said driven member and adapted forengagement to cause rocking movement of said control member in the otherdirection relative to said driven member to thereby disengage saidclutch dogs from said driving member.

an incident 6. In a clutch of thecharacter described, a constantlyrotating driving member having an integral annular flange spacedsubstantially, from the axis thereof, a separately formed annularelement secured on said driving member having an annular series ofinternal clutch teeth. formed thereon con-centric with the rotative axisof said driving member, a driven member comprising a disc supported forrotation on an axis concentric with the rotative axis of said drivingmember and disposed opposite and .in axially spaced relation to the openend of said flange, a pair of clutch dogs pivoted on said disc on axesparallel to and disposed on opposite sides of the rotative axis of saiddriven member and in the space Within said flange, said clutch dogshaving teeth formed thereon adjacent to corresponding ends thereof forengagement with the teeth on said annular element of said drivingmember, a control member pivoted on said axis of rotation of said drivenmember and disposed between said clutch dogs, said control member havingside edge surfaces disposed adjacent said clutch dogs, and said clutchdogs each having surfaces on opposite sides of their pivotal aXes forengagement by said con trol member to selectively impart clutch engagingor disengaging movementto said clutch dogs as an incident topredetermined rocking movement of said control member in one directionor the other relative to said driven member, spring means acting betweensaid control member and said driven member and tending to rock saidcontrol member in said one direction with relation to said driven memberto impart clutch engaging movement to said clutch dogs, an arm, on saidcontrol m mber in said space and projecting between said disc and saidflange in a generally radial direction beyond said driven. member andadapted for engagement to cause rocking move-- ment of said controlmember in the other direction relative to said driven member to therebydisengage said clutch dogs from said driving member, a stop leveradapted to be moved into the path of said arm to effect suchpredetermined rocking movementof said control member in said otherdirection, and said disc having a notch formed therein for engagement bysaid stop lever when such predetermined rocking movement of said controlmember in said other direction has been completed tothereby stop saiddriven memher in a predetermined rot'ative relationship.

7. In a clutch of the character described, a Constantly rotating drivingmember having an integral annular flange spaced substantially from theaxis thereof, a separately formed'annular element stationarily securedwithin said flange and having an annular series of internal clutch teethformed thereon concentric with the rotative axis of said driving member,a driven member comprising a disc supported for rotation on an axisconcentric With the rotative axis of said driving member and disposed.opposite and in axially spaced relation to the open end of said flange,a pair of clutch dogs pivoted on said disc" on axes parallel to anddisposed on opposite sidesof the rotative axis of said driven member andin the space within said flange, said clutch dogs having teeth formedthereon adjacent to corresponding ends thereof for engagement with theteethon said annular element of said driving member, a control memberpivoted on said axis of rotation of said driven member and disposedbetween said clutch dogs and operatively associated With said clutchdogs to selectively impart clutch engaging or disengaging movement tosaid clutch dogs as to predetermined rocking movement jec'tingisbetweensaid disc and saidflange' in a v generally radial/direction beyondsaid-driven -member and adapted for engagementto'cause rockingmovementof said control member in the other direction relative to saiddrivenmember to thereby disengage said clutch dogs from said 1driy ingmember,.a stop lever adapted to-be-moved" jinto the path of said arm tostop rotation of said control member with said drivenmember and therebyeffect such predetermined rocking movement of said control members insaidother direc- 12 and having an -annular --series of internalclutch'teeth formed thereon concentric with the -rota-tive -axis-of-----said drivingmember, a driven member 1 comprising a discsupported forrotation omen -axis concentric with the -rotative axis of-said"driving member and disposed oppositeand inwaxially spaced relationto theopen end-ofsaidflange a pair of shouldered moun-ting studsprojecting from'opposite sides of and parallel to the'rotative axis ofsaid driven member and into "the space. Within said flange, clutch dogsmountedon each of i the respective studs for pivotal movement on saidstuds, a hub "formed on said-driving member and engaging said 1.3'clutch dogs to ho'ld the same in position on saidstuds-and-imengagement with the shoulders of said s-tudsssaid 'clutchdogs having teeth formed i thereon: adjacentto" correspondin endsthereof Jfor-engagement -vv'ith: the teeth on said annular tion,andsaiddisc'havinga notch formed thereinw il 1 t, (oflsaid d ivi v mbmntrol mem- .for engagementby said stop lever when suchpredeterminedrockingvmovement"ofrsaid control member in said other direction-hasbeencompleted to thereby stop said driven member r a predeterminedrotative 'relationship-andtain the same in such relationship.

8. In a clutch of-the characterrdescribed, a constantly rotating drivingmember having an integral annular flange spaced substantially from theaxis thereof, aseparatelyformed an-: nular element secured within saidannular flange andhaving an annular; series of internal clutch teethformed thereon concentric-With the rotative axis of said drivingmember,v a driven member ber pivoted onsaid axis of rotation of saiddriven memberand "disposed:-betvveen said clutch dogs and operativelyassociated with said clutch dogs to impart clutch.idisengagingxmovementto said 4J clutch dogsas an incident tolpre'determined rocking-moveme'ntwofisaidz'control1.member in one direction relativeltoasaid:drivenfimember, spring means constantlynurgingisaid clutch dogs to im-.part'clut'ch engaging:Fmovementthereto, an arm "0n saidcontroli:memberxprojecting between said disc and .saidffiangeziinxaigenerally: radial directionbeyondsaidadrivensmember' and adapted forengagement to cause rocking movement of said control; member: :in-zsaidronerdir'ection relative to .comprisin a disc supported for rotation'onan w sid; driven memberz:.-to:rgtherebydisengage said axis concentric'withthe rotative axis of said drivingmember .and disposed opposite andin axially spaced relation. to the open end of said flange, a ipair ofclutch dogs pivoted cnsaid disc clutch; :dogs 1" from 5 saidz'driving'member, a stop lever. adapted: tozbe moved-into engagement withther;-periphery;zof'i said 5disc; so as to thereby lie in :thenpathior'saicl; arm; toqstop'rotation of said con- .0 axes parallel to anddisposed on Opposite uo:trohmemberrwith 'saidl-drivemmember and there-:ofvthe rotative axis of said driven member and in the space within saidflange, a hub on said v driving member engagingsaid dogsto maintain .thedogs on their pivotal supports in an axial byt'effect; such:predetermined rocking n-mcvement ofsaid:controlimember in said"onezdirection' with respectto; said'driven-m'ember; and saiddiscghaw-ingaa-notch iormedein thief-periphery thereof with "sense, said clutchdogs having teeth'formed there-1 45 the' leading-edgenof said notchbeveled to thereby .on adjacent to corresponding ends thereof for en-;g'agement with the teeth on said annular element of said drivingmember, a control member pivoted onsaid axis of rotation of said drivenmember and disposed between ,operatively associated with said clutch,dogs to impart clutch disengaging ,movement to said clutch ,dogs as anincident to predetermined rocking movement of said control member in oneexpose thetrailing edgeio'f thesnotchfor engage- :mentWith-5182;161:5130!) r1V8II WhYYSLlCh predetermined rocking movement;ofsaid-control member in said 'otherdirection. hasrbeen completed to saidclutch dogs and-"5o thereby stop saidz'driven. member in-a predeterminedrotative relationship and maintain the samein such relationship;said-notch bein somewhat deeper thansaidirr-beveled:leading-edge toenable, furtherrentryeof; ,isaid; stop lever intosaid direction relativeto said drivensmember, spring- 55 notchto-prevent retrggradeqmovementofsaid ;means,tending to impartclutch engaging-move- ..ment to said clutch.dogs and meanstonsaid control member in said spaceand projectingbetween .,.said 'discand saidsflangeeinia generally radial directionbeyond saiddrivenmemberand ,adapt'ed for .engagementutog cause, rocking,movementof said control member insaid. direction relative to said,drivemmember .to thereby disengage. said .,c1utch dogs fromsaid;driving member.

..,constant1y rotating driving member havingan liintegralannular flangespaced substantially from the axis thereof, a separately. formed annularelement stationarily. secured .Withinsaid. flange drivenfmember.

' :sEBANKLINi E. CURTIS.

, lawlessness cruise The "following references are of record in theof'this patentz' lumrnmsfrsrsstes'rsnrs :EMcGreWt H N 0v; 28,- 1939

